One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(18,22)(20,28)(23,29)(24,30)(25,31)(27,32) involution — undirected(2,6)(4,7)(9,10)(11,15)(12,14)(13,16)(18,23)(22,29)(24,25)(30,31) involution — undirected(1,3,5,8)(2,7,6,4)(9,11)(10,13)(12,16)(14,15)(17,18)(19,25)(20,29)(21,23)(22,28)(24,26)(27,30)(31,32)(2,6)(3,8)(11,16)(13,15)(17,19,21,26)(18,24,23,25)(20,27,28,32)(22,30,29,31)(1,4,5,7)(2,8,6,3)(10,14)(13,15)(18,23)(19,26)(22,29)(27,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.